.jshintrc

contrib: update to latest Python 2.7, 3.7, and 3.8

We would ideally update the 3.5 and 3.6 versions as well. But Python
didn't generate exe installers for newer versions for some reason.

Differential Revision: https://phab.mercurial-scm.org/D8466

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}